US9198084B2 - Wireless architecture for a traditional wire-based protocol - Google Patents
Wireless architecture for a traditional wire-based protocol Download PDFInfo
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- US9198084B2 US9198084B2 US11/624,642 US62464207A US9198084B2 US 9198084 B2 US9198084 B2 US 9198084B2 US 62464207 A US62464207 A US 62464207A US 9198084 B2 US9198084 B2 US 9198084B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
Definitions
- the following description relates generally to communication systems and more particularly to enabling traditional wire-based devices to communicate over a wireless link and/or a wired link.
- Wireless networking systems are utilized by many to communicate wherever the user may be located at a particular time (e.g., home, office, traveling, . . . ).
- Wireless communication devices have become smaller and more powerful (e.g., increased functionality and/or applications, larger memory capacity) to meet user needs while improving portability and convenience.
- Users have found many uses for wireless communication devices including cellular telephones, personal digital assistants (PDAs) and the like.
- wireless communication devices can include functionality to capture and process images (e.g., still images, moving images, video gaming, and the like).
- Some devices have traditionally only operated in a wired capacity, such as, for example, a Mobile Display Digital Interface (MDDI).
- MDDI Mobile Display Digital Interface
- a user having such a device may not be able to communicate while mobile and may need to expend further costs to obtain a wireless device, which may not always be feasible.
- a user may decide to operate two devices, one with wired capacity and one with wireless capacity to achieve the benefits of both devices.
- the costs associated with two devices, as well as keeping track of both devices might impose an undue burden on a user.
- a technique for allowing a traditionally wired-based protocol to communicate over either the wired architecture or a wireless architecture provides such flexibility with minimal changes to the wired architecture.
- various aspects are described in connection with transferring data traditionally communicated through a wired link over a high-speed wireless link.
- the disclosed embodiments provide the wired and/or wireless data communication with minimal changes on the existing wired architecture.
- the method includes querying a host for an available application data rate and measuring a round trip delay rate.
- a forward link rate and a reverse link rate are ascertained based on die measured round trip delay rate.
- An operation rate is computed based in part on the ascertained forward link rate and reverse link rate.
- the operation rate can be communicated to a receiver (e.g., mobile device).
- Computing an operation rate can include determining whether the forward link rate or the reverse link rate is the lower rate and designating that lower rate as the operation rate.
- the computation can include comparing the forward link rate, the reverse link rate, the available application data rate of a host, and a maximum capacity of a client to determine the lowest rate, which is assigned as the operation rate. According to some embodiments, a minimum allowable rate is established and the operation rate is adjusted if it is below the minimum allowable rate.
- the method includes placing a first portion of a client on a sender, placing a second portion of the client on a receiver, and providing wired functionality and wireless functionality at the receiver.
- the method can include connecting the sender to a data source and interfacing the first portion of the client to a host included on the sender with a wired link.
- the apparatus includes a transmitter comprising a host and a first portion of a client connected by a wired link and a receiver comprising a second portion of the client.
- the apparatus can include a query module that determines an operation rate based in part on a rate supported by a medium access control and a retransmission statistic and an assigner module that assigns a communication to a wired protocol or a wireless protocol.
- a mobile device for communicating over a wired link or a wireless link.
- the mobile device includes means for receiving an operation rate for a communication, means for communicating over a wireless link, and means for communicating over a wired link.
- the mobile device also includes means for selectively determining whether to utilize the wireless link or the wired link based in part on the received operation rate.
- the means for selectively determining whether to utilize the wireless link or the wired link based in part on the received operation rate can further determine whether to switch between the wireless link and the wired link.
- the method includes placing forward link data in a buffer, requesting unidirectional channel time allocations (CTAs) and sending the forward link data.
- the method can include placing reverse link data in a buffer, requesting reverse direction CTAs, sending the reverse link data and communicating data to a host in a reverse encapsulation packet.
- the method includes requesting a CTA for m msec in a forward direction and for n msec in a reverse direction and comparing the forward direction CTA to the reverse direction CTA.
- the method includes sending reverse link data during CTAs reserved for a reverse direction and deriving a time duration of a MAC frame.
- a computer readable medium having computer-executable instructions for contacting a host for an application data rate that the host provides and calculating a round trip delay.
- the instruction can include determining a forward link rate and a reverse link rate based in part on the calculated round trip delay and ascertaining an operation rate based in part on the determined forward link rate and reverse link rate.
- the instructions include determining a lowest rate of the forward link rate, the reverse link rate, the application data rate that the host provides, and a maximum capacity of a client. The determined lowest rate can be designated as the operation rate and this rate can be sent to a receiver.
- a processor that executes instructions for communicating over a wired link or a wireless link.
- the instructions include receiving a communication operation rate and selectively determining whether to communicate over a wired link or a wireless link based in part on the received communication operation rate.
- one or more embodiments comprise the features hereinafter fully described and particularly pointed out in the claims.
- the following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more embodiments. These aspects are indicative, however, of but a few of the various ways in which the principles of various embodiments may be employed and the described embodiments are intended to include all such aspects and their equivalents.
- FIG. 1 illustrates a block diagram of a system for enabling a traditional wire-based device to communicate wirelessly.
- FIG. 2 illustrates a system for extending the capabilities of a traditionally wired configuration to allow communication over a wireless link.
- FIG. 3 illustrates a system for communicating through wired and/or wireless architectures.
- FIG. 4 illustrates another embodiment of a system for extending traditionally wired configurations to allow communication over a wireless link.
- FIG. 5 illustrates a system for communicating over a wired link or a wireless link with a traditionally wired device.
- FIG. 6 illustrates an exemplary forward link MDDI data transfer in low-overhead mode in accordance with the various embodiments presented herein.
- FIG. 7 illustrates an exemplary reverse link MDDI data transfer in low-overhead mode in accordance with the various embodiments presented herein.
- FIG. 8 illustrates a low-latency mode MDDI connection setup in accordance with the various embodiments presented herein.
- FIG. 9 illustrates a methodology for configuring a traditionally wired device to communicate through a wired protocol and/or a wireless protocol.
- FIG. 10 illustrates a methodology for determining an operation rate according to the one or more disclosed embodiments.
- FIG. 11 illustrates a methodology for communicating in low overhead mode according to the various embodiments presented herein.
- FIG. 12 illustrates a methodology for communicating in low latency mode according to the various embodiments presented herein.
- FIG. 13 illustrates a conceptual block diagram of a possible configuration of a terminal.
- a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
- an application running on a computing device and the computing device can be a component.
- One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers.
- these components can execute from various computer readable media having various data structures stored thereon.
- the components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as the Internet with other systems by way of the signal).
- a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network, such as the Internet with other systems by way of the signal).
- a user device can also be called a system, a subscriber unit, subscriber station, mobile station, mobile device, remote station, access point, base station, remote terminal, access terminal, handset, user terminal, terminal, user agent, or user equipment.
- a user device can be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a PDA, a handheld device having wireless connection capability, or other processing device(s) connected to a wireless modem.
- SIP Session Initiation Protocol
- WLL wireless local loop
- various aspects or features described herein may be implemented as a method, apparatus, or article of manufacture using standard, programming and/or engineering techniques.
- article of manufacture as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media.
- computer readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips . . . ), optical disks (e.g., compact disk (CD), digital versatile disk (DVD) . . . ), smart cards, and flash memory devices (e.g., card, stick, key drive . . . ).
- MDDI Mobile Display Digital Interface
- IEEE 802.15.3 medium access control
- FIG. 1 illustrates a block diagram of a system 100 for enabling a traditional wire-based device to communicate wirelessly.
- System 100 includes a transmitter 102 in wired and/or wireless communication with a receiver 104 .
- Transmitter 102 and receiver 104 can be components that traditionally communicate over a wire-based protocol.
- a number of transmitter(s) 102 and receiver(s) 104 can be included in system 100 , as will be appreciated, a single transmitter 102 that transmits communication data signals to a single receiver 104 is illustrated for purposes of simplicity.
- Transmitter 102 may be connected to a data source 106 (e.g., storage, memory, and the like) and receiver 104 may be connected to an interface device 108 , such as a display.
- a data source 106 e.g., storage, memory, and the like
- receiver 104 may be connected to an interface device 108 , such as a display.
- System 100 can operate in at least two modes of operation, namely, a low overhead mode and/or a low latency mode.
- Low overhead mode optimizes a packet sent over the air (e.g., wirelessly) by requesting channel allocation time(s), which is the time for data to be sent from either direction (from sender to receiver or from receiver to sender).
- channel allocation time(s) can be determined based on knowledge of the data included in both the forward link and the reverse link.
- Transmitter 102 can be configured to ascertain a forward link rate and reverse link rate based on various criteria (e.g., round trip delay measurements). Transmitter 102 can send at least one reverse link encapsulation packet every frame. The reverse link encapsulation packet can be used to accommodate the transfer of reverse packets over the transfer link, creating the reverse link.
- Receiver 104 can be configured to receive and/or send data communication through a wired functionality and/or a wireless functionality.
- the determination of which functionality to utilize can be based on various criteria including type of data (e.g., voice, text, image, . . . ), the traditional method of communicating the data (e.g., wired link or wireless link), the size of the file or packet being transmitted, as well as other criteria relating to the data, the sender, and/or the receiver.
- Transmitter 102 can communicate the data without knowledge of how receiver 104 is receiving the data (e.g., wired or wireless).
- FIG. 2 illustrates a system 200 for extending the capabilities of a traditionally wired configuration to allow communication over a wireless link.
- System 200 includes a transmitter 202 that communicates with a receiver 204 over a forward link.
- Receiver 204 communicates with the transmitter 202 over a reverse link.
- Transmitter 202 and receiver 204 can be devices that generally communicate over a wired protocol, however, system 200 allows such devices to communicate over the wired protocol and/or over a wireless protocol, such as over a high-speed wireless link.
- a number of transmitter(s) 202 and receiver(s) 204 can be included in system 200 , as will be appreciated, a single transmitter 202 that transmits communication data signals to a single receiver 204 is illustrated for purposes of simplicity.
- Transmitter 202 can include a host 206 , a portion of a client (C 1 ) 208 , and a communication component 210 .
- Host 206 can be an MDDI host, for example. In some embodiments, host 206 can be a component separate from transmitter 202 and connected to transmitter 202 through a wired link. A portion of client (C 1 ) 20 S is kept on or in communication with host 206 for clock synchronization.
- Client (C 1 ) 208 can be connected to host 206 through a traditional wired link (e.g., MDDI link), for example.
- Host 206 can be configured to send or communicate packets of data to client (C 1 ) 208 .
- These packets can be communicated to receiver 204 through communication component 210 , which can include a modem, such as an ultra wide band (UWB) modem.
- Some packets e.g., MDDI round-trip delay measurement packets
- client (C 1 ) 208 Some packets (e.g., MDDI round-trip delay measurement packets) are processed by client (C 1 ) 208 and communicated to receiver 204 .
- Other packets e.g., filler packets
- a filler packet for example, maintains timing between transmitter 202 and receiver 204 .
- Such packets can be generated by either transmitter 202 or receiver 204 through respective client portions.
- Receiver 204 can include an interface device 212 (e.g., display), a portion of client (C 2 ) 214 , and a communication component 216 .
- the device 212 can be a component separate from the receiver 204 and connected to the receiver 204 through, for example, a wired link.
- Client (C 2 ) 214 can be connected to device 212 through a wired link.
- Client (C 2 ) 214 can be configured to process a packet received from transmitter 202 .
- Receiver 204 can receive the communication from transmitter 202 through communication component 216 that can include, for example, a UWB modem.
- System 200 can be configured to operate in one of two modes of operation. These modes include a low overhead mode and a low latency mode.
- client (C 1 ) 208 places the data to be sent, excluding for example, fill packets and round trip delay packets, in a buffer that can be included on the communication component 210 (e.g., UWB modem).
- the communication component 210 through a UWB MAC, for example, can periodically request unidirectional channel time allocations (CTA) from transmitter 202 to receiver 204 based on the size of the buffer.
- CTA channel time allocations
- client (C 2 ) 214 can place the reverse link data that it wants to send, excluding filler packets, for example, in a buffer associated with communication component 216 (e.g., UWB modem).
- the communication component 216 can request reverse-direction CTAs.
- communication component 210 can request a CTA for m msec in the forward direction and a CTA for n msec in the reverse direction.
- the expected ratio of traffic in the forward and reverse, directions is m:n and m sec is the duration corresponding to a forward link transfer rate of R f-mddi .
- T is a superframe duration, which is determined by the latency constraints of the application where: ( m+n ) ⁇ T CTAP ⁇ T
- System 300 includes a transmitter 302 and a receiver 304 that communicate over a forward link (from transmitter 302 ) and/or a reverse link (from receiver 304 ).
- the communication over the forward link and/or reverse link can be over a wired protocol and/or over a wireless protocol depending on the particular situation (e.g., data to be transmitted, data rates, quality of communication link, status of each device, . . . ).
- a number of transmitter(s) 302 and receiver(s) 304 can be included in system 300 , as will be appreciated, a single transmitter 302 that transmits communication data signals to a single receiver 304 is illustrated for purposes of simplicity.
- Transmitter 302 can include a host component 306 connected to a client (C 1 ) component 308 and a communication component 310 .
- Receiver 304 can include a device 312 connected to a client (C 2 ) component 314 and a communication component 316 .
- Client (C 1 ) component 308 and client (C 2 ) component 314 are respective portions of a client.
- transmitter 302 and/or receiver 304 can include additional components.
- transmitter 302 can include an encoder component (not shown) that can modulate and/or encode signals in accordance with a suitable wireless communication protocol which signals can then be transmitted to receiver 304 .
- encoder component can be a voice coder (vocoder) that utilizes a speech analyzer to convert analog waveforms into digital signals or another type of encoder.
- Suitable wireless communication protocols can include, but are not limited to.
- Orthogonal Frequency Division Multiplexing OFDM
- Orthogonal Frequency Division Multiplexing Access OFDMA
- Code Division Multiple Access CDMA
- Time Division Multiple Access TDMA
- GSM Global System for Mobile Communications
- HSDPA High-Speed Downlink Packet Access
- Receiver 304 can include a decoder component (not shown) that can decode a received signal and/or data packet therein for processing.
- a decoder component (not shown) that can decode a received signal and/or data packet therein for processing.
- an acknowledgment component (not shown) can generate an acknowledgment that indicates successful decode of the data packet, which can be sent to transmitter 302 to inform transmitter 302 that the data packet was received and decoded, and therefore need not be retransmitted.
- Host component 306 can include a query module 318 and a measurement module 320 .
- Query module 318 can be configured to query a host medium access control (MAC) for an application data rate that the MAC provides.
- the operation rate may depend upon the rate of the wireless link.
- Measurement module 320 can be configured to determine the forward link rate and the reverse link rate based on, for example, a round trip delay measurement, which may be specified in the wireless protocol.
- the wireless operation rate can be determined by the minimum of the two rates (forward link rate and reverse link rate), the maximum capacity of host 306 , and the maximum capacity of client (C 1 ) 308 . There should be a minimum allowable rate R min .
- the operation rate can be adjusted by transmitter 302 and/or receiver 304 through respective components (e.g., communication components 310 and/or 316 ).
- Transmitter 302 can notify receiver 304 the rate at which the communication will be processed.
- Client (C 2 ) component 314 can include a notifier module 322 that can be configured to notify transmitter 302 the application data rate that the MAC provides. Such notification can be based on a query received from transmitter 302 (e.g., a query sent by query module 318 ). For reverse link packets, notifier module 322 can specify the number of bytes needed by receiver 304 to send on the reverse link in the current frame.
- Client (C 2 ) component 314 can also include an assigner module 324 that can be configured to assign a communication to a wired protocol or a wireless protocol depending on various parameters associated with a communication (e.g., communication type, rate of communication, sender, receiver, and the like).
- Communication component 316 can include a wired module 326 and a wireless module 328 .
- the wired module 326 can be configured to provide wired functionality and the wireless module 328 can be configured to provide wireless functionality.
- a determination can be made whether to communicate wirelessly utilizing the wireless module 328 or to communicate utilizing the wired module 326 . Such a determination can be based on a variety of factors including the operation rate, the type of data being transmitted (e.g., voice, text, image, . . . ), the size of the data or files being transmitted, if the data is typically communicated over a wired link or a wireless link, etc.
- Wired module 326 and/or wireless module 328 can include a buffer for storing content so that if a change is made during a communication from one module to the other module (e.g., wireless to wired, wired to wireless) communication is not lost due to switchover issues.
- Transmitter 302 performs its functions in substantially the same way regardless of the communication method (wired or wireless).
- transmitter 302 can include a component configured to fragment a sub-frame (not shown) and receiver 304 can include a component configured to reassemble the sub-frame (not shown).
- the maximum length of an MDDI sub-frame for example, can be about 65,536 bytes, although it is generally smaller.
- the maximum size of an 802.15.3 MAC frame can be approximately 4,096 or around 8,192 bytes, if the underlying rate is about 480 Mbps.
- the size can be around 2,048 bytes if the underlying physical layer rate is approximately 200 Mbps.
- the sub-frame may need to be fragmented on the transmitter 302 side and reassembled on the receiver 304 side to accommodate the size of the frame.
- Such fragmenting and reassembly can be performed by respective communication components 310 and 316 and/or other components associated with transmitter 302 and receiver 304 .
- FIG. 4 illustrates another embodiment of a system 400 for extending traditionally wired configurations to allow communication over a wireless link.
- System 400 can include a transmitter 402 that includes a host 406 , a portion of a client (C 1 ) 408 , and a communication component 410 .
- System 400 can also include a receiver 404 that includes a device 412 , a portion of a client (C 2 ) 414 , and a communication component 416 .
- Transmitter 402 communicates to receiver 404 over a forward link and receiver 404 communicates to transmitter 402 over a reverse link.
- a number of transmitter(s) 402 and receiver(s) 404 can be included in system 400 , a single transmitter 402 that transmits communication data signals to a single receiver 404 is illustrated for purposes of simplicity.
- System 400 can include a memory 418 operatively coupled to receiver 404 .
- Memory 418 can store information related to a data rate for a packet and/or a packet type (e.g., application data rate provided by MAC, operation rate of the wireless link, . . . ). mode of operation for a packet and/or packet type, and/or other parameters associated with transmitting data over a wireless protocol, over a wired protocol, or a combination of these protocols.
- a wired protocol can be used for a communication and a decision can be made to switch to a wireless protocol during the communication, or vice versa, without interruption or termination.
- a processor 420 can be operatively connected to receiver 404 (and/or memory 418 ) to facilitate analysis of information related to ascertaining whether a particular communication should be sent over a wired protocol or a wireless protocol
- Processor 420 can be a processor dedicated to analyzing and/or generating information communicated to receiver 404 , a processor that controls one or more components of system 400 , and/or a processor that both analyzes and generates information received by receiver 404 and controls one or more components of system 400 .
- Memory 418 can store protocols associated with data communication rates, operation rates, taking action to control communication between receiver 404 and transmitter 402 , etc., such that system 400 can employ stored protocols and/or algorithms to achieve improved communication in a wireless network as described herein.
- the data store (e.g., memories) components described herein can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory.
- nonvolatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPRGM), electrically erasable ROM (EEPROM), or flash memory.
- Volatile memory can include random access memory (RAM), which acts as external cache memory.
- RAM is available in many forms such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).
- SRAM synchronous RAM
- DRAM dynamic RAM
- SDRAM synchronous DRAM
- DDR SDRAM double data rate SDRAM
- ESDRAM enhanced SDRAM
- SLDRAM Synchlink DRAM
- DRRAM direct Rambus RAM
- FIG. 5 illustrates a system 500 for communicating over a wired link or a wireless link with a traditional wired device.
- System 500 is represented as functional blocks, which can be functional blocks that represent functions implemented by a processor, software or combination thereof (e.g., firmware).
- System 500 includes a receiver 502 that can be configured to receive an operation rate for a communication. This operation rate can be received from, for example, a sender or a sender host. The operation rate can set up or establish the rate of communication in both a forward direction and a reverse direction.
- System 500 also includes a wireless communicator 504 that can be configured to send and/or receive a communication over a wireless protocol.
- a wired communicator 506 can be configured to send and/or receive a communication over a wired protocol.
- a forward and/or a reverse direction there may be packet extensions and/or new packets.
- MDDI sender information can be added to a packet.
- This packet extension can provide an MDDI client on the receiver end with MDDI sender side information. This information can include the rate at which the MDDI host and client should operate on the sender side.
- extensions to a client capability packet can include about four bytes for MDDI receiver MAC information and around two bytes for MDDI receiver client information, however other extensions are also possible.
- a determiner 508 can selectively determine whether to utilize the wireless communicator to communicate over the wireless protocol or whether to utilize the wired communicator to communicate over the wired protocol. Such a determination can be selectively made based on various parameters, such as the communication operation rate. Other parameters can also be analyzed to make the determination. For example, the determination can be made based on how the particular communication has been traditionally sent and/or received (e.g., historical analysis), the type of communication (e.g., voice, image, text, . . . ), as well as other parameters relating to the communication, the sender, and/or the receiver.
- various parameters such as the communication operation rate.
- Other parameters can also be analyzed to make the determination. For example, the determination can be made based on how the particular communication has been traditionally sent and/or received (e.g., historical analysis), the type of communication (e.g., voice, image, text, . . . ), as well as other parameters relating to the communication, the sender, and/or the receiver
- FIG. 6 illustrates an exemplary forward link MDDI data transfer 600 in low-overhead mode in accordance with the various embodiments presented herein.
- One type of mode for an MDDI sender 602 to send data to an MDDI receiver 604 can be a low overhead mode. In this mode, a packet sent wirelessly is optimized for channel allocation time, which is the time it takes for data to be sent from either direction (e.g., forward or reverse).
- MDDI sender 602 can include a portion of a client (C 1 ) 606 and MDDI receiver 604 can include a portion of the client processing (C 2 ) 608 .
- An MDDI client (C 1 ) 606 can place the data to be sent in a buffer, such as on a UWB modem.
- the data to be sent should exclude unnecessary packets, such as fill packets and round trip delay packets, for example.
- the MDDI data is sent to a sender MAC 610 , as illustrated at 612 .
- Sender MAC 610 (or UWB MAC) may periodically or continuously request at least one CTA from MDDI sender 602 to MDDI receiver 604 based on, for example, the size of the buffer.
- Sender MAC 610 can request, at 614 , forward link CTAs (e.g., periodically or continuously) from a piconet controller (PNC) MAC 616 .
- PNC MAC 616 can respond to sender MAC 610 with a channel time response code at 618 . This response code can indicate whether the data has been communicated successfully.
- sender MAC 610 can send the MDDI data to a receiver MAC 620 , as indicated at 622 .
- FIG. 7 illustrates an exemplary reverse link MDDI data transfer 700 in low-overhead mode in accordance with the various embodiments presented herein.
- An MDDI receiver 702 can initiate, over a reverse link, communication intended for an MDDI sender 704 .
- MDDI receiver 702 can include a portion of client (C 2 ) 706 and MDDI sender 704 can include a portion of client (C 1 ) 708 .
- MDDI receiver 702 can send MDDI data to a receiver MAC 710 , as indicated at 712 .
- Receiver MAC 710 can request from a PNC MAC 714 reverse link CTAs, at 716 . The request can correspond to the data that should be sent in the reverse direction.
- PNC MAC 714 can respond, at 718 , with a channel time response code.
- Receiver MAG 710 can, at 720 , send MDDI data in CTAs to sender MAC 722 .
- sender MAC 722 may have sent or given MDDI data to client (C 1 ) 708 at some time before or at substantially the same time as receiving the MDDI data from receiver MAC 710 .
- An MDDI sender host 726 can send and/or receive at least one reverse link encapsulation every frame, as indicated at 728 and 730 .
- the reverse link data can be sent proactively, without waiting for a data request.
- the client can specify the number of bytes it needs to send on the reverse link in the current frame.
- the MDDI sender host 726 can correspondingly allocate the request in the reverse link encapsulation packet.
- FIG. 8 illustrates, a low-latency mode MDDI connection setup 800 in accordance with the various embodiments presented herein.
- channel allocation time can be ascertained based on an inference derived from data contained in packets in both the forward direction and the reverse direction.
- a MDDI sender 802 can include a host 804 and a portion of a client (C 1 ) 806 .
- a UWB modem on the sender 802 can send a MAC query, at 810 , to a sender MAC 808 .
- a MAC query is a query sent to find out the rate supported by the MAC and retransmission statistics.
- Sender MAC 808 can respond to the query at 812 . This response can be a MAC response that indicates the rate supported by the MAC retransmission statistics.
- Sender 802 requests a CTA setup 814 for m msec in the forward direction and a CTA for n msec in the reverse direction.
- the expected ratio of traffic in the forward and reverse directions should be m:n.
- CTRq channel time request
- a channel time response code can be sent in the reverse direction, shown at 820 , and in the forward direction, shown at 822 and sent to a receiver MAC 824 .
- MDDI sender 802 can begin an MDDI transfer, as illustrated at 826 .
- the duration corresponding to the MDDI forward link transfer rate of R f-mddi is m sec, and when T is the super-frame duration determined by the latency constraints of the application, the following formula applies: m+n ⁇ T CTAP ⁇ T
- the reverse link data can be sent during the CTAs reserved in the reverse direction.
- N is the size of the reverse link packet that should be sent and n is the reverse link CTA duration in each super frame.
- R 1 is the physical layer transmission rate of the MDDI data (MAC payload).
- R 2 is the physical layer transmission rate of the PHY, MAC headers and the preamble.
- T ft The latency of the forward link packets, T ft , can be determined accordingly. Given the application latency constraints in forward and reverse links, the time duration of the MAC frame can be derived accordingly. For example, various algorithms, methods, and/or techniques can be employed to derive the time duration of the MAC frame and/or the latency of the forward link packets.
- a methodology 900 for configuring a traditionally wired device to communicate through a wired protocol and/or a wireless protocol is illustrated.
- a first portion of a client is placed on an MDDI sender.
- the MDDI sender can be wireless and can be connected to a data source.
- the MDDI sender can also include an MDDI host connected or interfaced to the client portion by, for example, a traditional wired MDDI link.
- a second portion of the client is placed on an MDDI receiver, which can be a wireless MDDI receiver.
- the MDDI receiver can be connected to a device, which can be, for example, a display.
- the portion of the client placed on the MDDI sender and the portion of the client placed on the MDDI receiver are distinct portions of the same client. It should be noted that the respective portions of the client can be portions implemented by a processor, software or combination thereof (e.g., firmware).
- Both a wired functionality and a wireless functionality are provided, at 906 .
- This functionality is included on the MDDI receiver, enabling the MDDI receiver to communicate through the wired functionality, the wireless functionality, or both functionalities.
- an MDDI receiver can be a mobile device that may receive a communication, such as a movie that is displayed on a CRT screen or display.
- the mobile device may also be connected to a wall-mounted display, allowing the movie to be displayed on the wall so that others can view the imagery.
- the mobile device is multi-functional, it can broadcast the movie on the display and can at substantially the same time receive or send a voice communication, different from the voice communication associated with the movie.
- a user of the mobile device may conduct a communication separate from the movie.
- An example where this might be utilized is when a user's children are watching a movie and the user wants to answer the phone and walk away.
- the movie can be displayed through a wired functionality and at substantially the same time the user can communicate through the wireless functionality.
- FIG. 10 illustrates a methodology 1000 for determining an operation rate according to the one or more disclosed embodiments.
- the MDDI operation rate depends, in part, on the rate of the wireless link.
- the method 1000 for determining an operation rate begins, at 1002 , where a host MAC is queried for an available application data rate (e.g., the application data rate that the MAC provides).
- the query can be requested by an MDDI host, for example.
- a round trip delay is measured.
- the round trip delay measurement can be utilized, at 1006 , to determine or ascertain a forward link rate and a reverse link rate.
- the round trip delay measurement can be specified in a wired MDDI protocol that should be used.
- An operation rate is computed at 1008 .
- the operation rate can be computed based in part by comparing the forward link rate and the reverse link rate and determining which is the minimum of the two rates.
- the minimum of these two rates can be designated as the operation rate.
- the minimum of these two rates forward link rate and reverse link rate
- the operation rate is communicated or sent to a receiver (e.g., MDDI receiver) to notify the receiver the rate at which the communication will proceed.
- a receiver e.g., MDDI receiver
- a transmitter can query the host MAC through a query module.
- the transmitter can further measure the round trip delay, ascertain forward and reverse link rate, and compute the operation rate utilizing a measurement module.
- the transmitter can also send the operation rate to the receiver utilizing a communication component.
- FIG. 11 illustrated is a methodology 1100 for communicating in low overhead mode according to the various embodiments presented herein.
- the forward link is shown on the left side of the figure and the reverse link is shown on the right side of the figure.
- forward link data is placed in a buffer. Excluded from the data placed in the buffer can be unnecessary data such as fill packets and/or round trip delay packets.
- This data can be placed in the buffer by an MDDI client (C 1 ) on an MDDI sender, for example.
- unidirectional CTAs are requested (e.g., periodically or continuously).
- a UWB MAC can request this information from the MDDI sender to a receiver based on, for example, the size of the buffer.
- the forward link data can be sent, at 1106 .
- a host sends at least one reverse link encapsulation packet every frame.
- a client e.g., receiver
- the host can specify the number of bytes that should be sent on the reverse link in the current frame.
- the host e.g., sender
- reverse link data that should be sent is placed in a buffer by, for example, an MDDI client (C 2 ).
- the buffer can be located on a UWB modem of an MDDI receiver.
- a request for reverse direction CTAs is sent, at 1110 , by, for example, a UWB modem on the MDDI receiver side. The request can be for those CTAs in the reverse direction corresponding to the data that should be sent in the reverse direction.
- An MDDI client on the receiver (C 2 ) can send reverse link data to the client on the sender (C 1 ) proactively, at 1112 .
- an MDDI client on the sender (C 1 ) sends the data it has to the MDDI host in the reverse encapsulation packet.
- FIG. 12 illustrates a methodology 1200 for communicating in low latency mode according to the various embodiments presented herein.
- the forward link is shown on the left side of the figure and the reverse link is shown on the right side of the figure.
- a UWB modem on the sender for example, requests, at 1202 , a CTA for m msec in the forward direction.
- a CTA request for n msec is sent in the reverse direction.
- a comparison of the forward and reverse CTAs received in response to the requests is made, at 1206 .
- the expected ratio of traffic in the forward and reverse directions is m:n.
- m msec is the duration corresponding to the MDDI forward link transfer rate of R f-mddi and: ( m+n ) ⁇ T CTAP ⁇ T where T is the super-frame duration, which can be determined by the latency constraints of the application.
- the reverse link data is sent, at 1208 , during the CTAs reserved in the reverse direction.
- a time duration of the MAC frame can be derived from the application latency constraints in the forward and reverse links.
- k is the average number of retransmissions experienced by a MAC frame.
- N is the size of the reverse link packet that should be sent and n is the reverse link CTA duration in each super frame.
- R 1 is the physical layer transmission rate of the MDDI data (MAC payload).
- R 2 is the physical layer transmission rate of the PHY, MAC headers and the preamble.
- H is the size of the MAC and the size of PHY header and the size of the preamble.
- FIG. 13 illustrated is a conceptual block diagram of a possible configuration of a terminal 1300 .
- Processor 1302 can implement the systems and methods disclosed herein.
- Terminal 1300 can be implemented with a front-end transceiver 1304 coupled to an antenna 1306 .
- a base band processor 1308 can be coupled to the transceiver 1304 .
- the base band processor 1308 can be implemented with a software based architecture, or other type of architectures.
- a microprocessor can be utilized as a platform to run software programs that, among other functions, provide control and overall system management function.
- a digital signal processor (DSP) can be implemented with an embedded communications software layer, which runs application specific algorithms to reduce the processing demands on the microprocessor.
- the DSP can be utilized to provide various signal processing functions such as pilot signal acquisition, time synchronization, frequency tracking, spread-spectrum processing, modulation and demodulation functions, and forward error correction.
- Terminal 1300 can also include various user interfaces 1310 coupled to the base band processor 1308 .
- User interfaces 1310 can include a keypad, mouse, touch screen, display, ringer, vibrator, audio speaker, microphone, camera and/or other input/output devices.
- the base band processor 1308 comprises a processor 1302 .
- the processor 1302 may be a software program running on a microprocessor.
- the processor 1302 is not limited to this embodiment, and may be implemented by any means known in the art, including any hardware configuration, software configuration, or combination thereof, which is capable of performing the various functions described herein.
- the processor 1302 can be coupled to memory 1312 for the storage of data.
- the embodiments described herein may be implemented by hardware, software, firmware, middleware, microcode, or any combination thereof.
- the systems and/or methods When the systems and/or methods are implemented in software, firmware, middleware or microcode, program code or code segments, they may be stored in a machine-readable medium, such as a storage component.
- a code segment may represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program statements.
- a code segment may be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted using any suitable means including memory sharing, message passing, token passing, network transmission, etc.
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Abstract
Description
(m+n)<T CTAP <T
m+n<T CTAP <T
T r1=ceil[{k*(N/R 1 +RIFS+H/R 2)+SIFS+T ACK }/n]*T
where k is the average number of retransmissions experienced by a MAC frame. N is the size of the reverse link packet that should be sent and n is the reverse link CTA duration in each super frame. R1 is the physical layer transmission rate of the MDDI data (MAC payload). R2 is the physical layer transmission rate of the PHY, MAC headers and the preamble. H is the size of the MAC plus the size of the PHY header plus the size of the preamble. SIFS is the short inter-frame spacing duration. RIFS is the retransmission inter-frame spacing duration. TACK is the duration of transmission of the ACK. T is the super-frame duration. For explanation purposes, it is assumed that the ACK policy is Imm-ACK. The latency of the forward link packets, Tft, can be determined accordingly. Given the application latency constraints in forward and reverse links, the time duration of the MAC frame can be derived accordingly. For example, various algorithms, methods, and/or techniques can be employed to derive the time duration of the MAC frame and/or the latency of the forward link packets.
(m+n)<T CTAP <T
where T is the super-frame duration, which can be determined by the latency constraints of the application.
T r1=ceil[{k*(N/R 1 +RIFS+H/R 2)+SIFS+T ACK }/n]*T
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